// 处理简单树状类型数据
let arr1 = [
  { id: 1, pid: 0, name: '1' },
  { id: 2, pid: 0, name: '2' },
  { id: 3, pid: 1, name: '3' },
  { id: 4, pid: 3, name: '4' },
  { id: 5, pid: 4, name: '5' }
]



// 处理复杂树状类型数据
let arr2 = [
  {
      "id": "604e115c7bfcfa45d019d3e9",
      "pid": "-1",
      "name": "传智教育",
      "code": "1",
      "introduce": "程序员的摇篮",
      "createTime": "2021-11-17 14:17:01"
  },
  {
      "id": "604e21feb205b95968e13129",
      "pid": "",
      "name": "总裁办",
      "code": "1001",
      "manager": "管理员",
      "introduce": "公司战略部",
      "createTime": "2021-03-14 22:47:25",
      "children": []
  },
  {
      "id": "604e222bb205b95968e1312a",
      "pid": "",
      "name": "行政部",
      "code": "XZB",
      "manager": "管理员",
      "introduce": "行政部",
      "createTime": "2021-03-14 22:47:25",
      "children": []
  },
  {
      "id": "604e223fb205b95968e1312b",
      "pid": "",
      "name": "人事部",
      "code": "RSB",
      "manager": "管理员",
      "introduce": "人事部",
      "createTime": "2021-03-14 22:47:25",
      "children": []
  },
  {
      "id": "604e2251b205b95968e1312c",
      "pid": "",
      "name": "财务部",
      "code": "CWB",
      "manager": "管理员",
      "introduce": "财务部",
      "createTime": "2021-03-14 22:47:25",
      "children": [
          {
              "id": "604e2262b205b95968e1312d",
              "pid": "604e2251b205b95968e1312c",
              "name": "财务核算部",
              "code": "CWHSB",
              "manager": "管理员",
              "introduce": "财务核算部",
              "createTime": "2021-03-14 22:47:25",
              "children": []
          },
          {
              "id": "604e227db205b95968e1312e",
              "pid": "604e2251b205b95968e1312c",
              "name": "税务管理部",
              "code": "SWGLN",
              "manager": "管理员",
              "introduce": "税务管理部",
              "createTime": "2021-03-14 22:47:25",
              "children": []
          },
          {
              "id": "604e2297b205b95968e1312f",
              "pid": "604e2251b205b95968e1312c",
              "name": "薪资管理部",
              "code": "XZGLB",
              "manager": "管理员",
              "introduce": "薪资管理部",
              "createTime": "2021-03-14 22:47:25",
              "children": []
          }
      ]
  },
  {
      "id": "604e2262b205b95968e1312d",
      "pid": "604e2251b205b95968e1312c",
      "name": "财务核算部",
      "code": "CWHSB",
      "manager": "管理员",
      "introduce": "财务核算部",
      "createTime": "2021-03-14 22:47:25",
      "children": []
  },
  {
      "id": "604e227db205b95968e1312e",
      "pid": "604e2251b205b95968e1312c",
      "name": "税务管理部",
      "code": "SWGLN",
      "manager": "管理员",
      "introduce": "税务管理部",
      "createTime": "2021-03-14 22:47:25",
      "children": []
  },
  {
      "id": "604e2297b205b95968e1312f",
      "pid": "604e2251b205b95968e1312c",
      "name": "薪资管理部",
      "code": "XZGLB",
      "manager": "管理员",
      "introduce": "薪资管理部",
      "createTime": "2021-03-14 22:47:25",
      "children": []
  },
  {
      "id": "6051ad90e93db6522c1d00d2",
      "pid": "",
      "name": "技术部",
      "code": "JSB",
      "manager": "孙财",
      "introduce": "技术部",
      "createTime": "2021-03-17 15:18:23",
      "children": [
          {
              "id": "6051adb6e93db6522c1d00d3",
              "pid": "6051ad90e93db6522c1d00d2",
              "name": "Java研发部",
              "code": "JYFB",
              "manager": "管理员",
              "introduce": "JAVA研发部",
              "createTime": "2021-03-17 15:18:23",
              "children": []
          },
          {
              "id": "6051add6e93db6522c1d00d4",
              "pid": "6051ad90e93db6522c1d00d2",
              "name": "Python研发部",
              "code": "PYFB",
              "manager": "罗晓晓",
              "introduce": "Python研发部",
              "createTime": "2021-03-17 15:18:23",
              "children": []
          },
          {
              "id": "6051adefe93db6522c1d00d5",
              "pid": "6051ad90e93db6522c1d00d2",
              "name": "Php研发部",
              "code": "PhpYFB",
              "manager": "孙财",
              "introduce": "Php研发部",
              "createTime": "2021-03-17 15:18:23",
              "children": []
          }
      ]
  },
  {
      "id": "6051adb6e93db6522c1d00d3",
      "pid": "6051ad90e93db6522c1d00d2",
      "name": "Java研发部",
      "code": "JYFB",
      "manager": "管理员",
      "introduce": "JAVA研发部",
      "createTime": "2021-03-17 15:18:23",
      "children": []
  },
  {
      "id": "6051add6e93db6522c1d00d4",
      "pid": "6051ad90e93db6522c1d00d2",
      "name": "Python研发部",
      "code": "PYFB",
      "manager": "罗晓晓",
      "introduce": "Python研发部",
      "createTime": "2021-03-17 15:18:23",
      "children": []
  },
  {
      "id": "6051adefe93db6522c1d00d5",
      "pid": "6051ad90e93db6522c1d00d2",
      "name": "Php研发部",
      "code": "PhpYFB",
      "manager": "孙财",
      "introduce": "Php研发部",
      "createTime": "2021-03-17 15:18:23",
      "children": []
  },
  {
      "id": "6051ae03e93db6522c1d00d6",
      "pid": "",
      "name": "运营部",
      "code": "YYB",
      "manager": "孙财",
      "introduce": "运营部",
      "createTime": "2021-03-17 15:18:23",
      "children": []
  },
  {
      "id": "6051ae15e93db6522c1d00d7",
      "pid": "",
      "name": "市场部",
      "code": "SCB",
      "manager": "孙财",
      "introduce": "市场部",
      "createTime": "2021-03-17 15:18:23",
      "children": [
          {
              "id": "6051ae28e93db6522c1d00d8",
              "pid": "6051ae15e93db6522c1d00d7",
              "name": "北京事业部",
              "code": "BJSYB",
              "manager": "孙财",
              "introduce": "BJSYB",
              "createTime": "2021-03-17 15:18:23",
              "children": []
          },
          {
              "id": "6051ae3de93db6522c1d00d9",
              "pid": "6051ae15e93db6522c1d00d7",
              "name": "上海事业部",
              "code": "SHSYB",
              "manager": "文吉星",
              "introduce": "上海事业部",
              "createTime": "2021-03-17 15:18:23",
              "children": []
          }
      ]
  },
  {
      "id": "6051ae28e93db6522c1d00d8",
      "pid": "6051ae15e93db6522c1d00d7",
      "name": "北京事业部",
      "code": "BJSYB",
      "manager": "孙财",
      "introduce": "BJSYB",
      "createTime": "2021-03-17 15:18:23",
      "children": []
  },
  {
      "id": "6051ae3de93db6522c1d00d9",
      "pid": "6051ae15e93db6522c1d00d7",
      "name": "上海事业部",
      "code": "SHSYB",
      "manager": "文吉星",
      "introduce": "上海事业部",
      "createTime": "2021-03-17 15:18:23",
      "children": []
  }
]



function changeData(arr, str = '') {
  return arr.filter((item) => {
    if (item.pid === str) {
      item.children = changeData(arr, item.id)
      return true
    }
  })
}

let newArr1 = changeData(arr1,0)
console.log(newArr1);
let newArr2 = changeData(arr2)
console.log(newArr2);